FORM 150.75-NM2
79
YORK INTERNATIONAL
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4. Program the Dip Switches on the Microprocessor
Board (Page 38) and verify the selection by press-
ing the OPTIONS key.
Switch 3 should always be open.
Switch 4 should always be closed.
Switch 6 should always be open.
NOTE: It is IMPORTANT that all switches are properly
programmed. Otherwise, undesirable operation
will result.
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5. Press the PROGRAM key and program each of
the 10 limits and record them.
They are as follows:
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Discharge Cut-out ____________________ PSIG
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Outside Air Temp Low Cut-out __________ °F
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Outside Air Temp High Cut-out __________ °F
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Discharge Pressure Unload Pressure ____PSIG
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Suction Pressure Unload Pressure ______PSIG
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Leaving Water Temp Cut-out ___________ °F
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Suction Pressure Cut-out ______________ PSIG
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Rate Control Temperature ______________ °F
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Anti Recycle Time ____________________ SEC.
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Rate Sensitivity ______________________ °F/MIN.
See page 45 for assistance in programming these
values.
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6. Program the date and time by first assuring that
the CLK jumper J18 on both Microprocessor
Boards (Fig. 34) is in the ON position (Top 2 pins).
Press the SET TIME key and set the date and
time (Page 49).
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7. Program the Daily and Holiday Start/Stop Sched-
ule by pressing the SET SCHEDULE/HOLIDAY
key (Page 50).
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8. Program the Chilled Liquid Setpoint and Control
Range by pressing the CHILLED LIQUID TEMP/
RANGE key (Page 52). Record the setpoint and
control range: Setpoint: _____________ °F
Control Range: ________ °F
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9. If the Remote Reset is to be used, the maximum
reset must be programmed. This can be pro-
grammed by pressing the REMOTE RESET
TEMP RANGE key (Page 75).
INITIAL START-UP
After the operator has become thoroughly familiar with
the control panel and has performed the preceding
checks 24 hours prior to start-up, the unit can be put
into operation.
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Place the System Switches to the ON position. See
the OPERATING SEQUENCE for unit operation.
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The compressor will start and a flow of liquid should
be noted in the liquid indicator. After several min-
utes of operation, the bubbles will disappear and
there will be a solid column of liquid when the unit
is operating normally. On start-up, foaming of the
oil may be evident in the compressor oil sight glass.
After the water temperature has been pulled down
to operating conditions, the oil should be clear. Nor-
mal operation of the unit is evidenced by a hot dis-
charge line (discharge superheat should not drop
below 50°F) clear oil in the compressor crankcase,
solid liquid refrigerant in the liquid indicator and usu-
ally no more than 2 PSIG variation in suction pres-
sure for any given set of operating conditions.
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Allow the compressor to run for a short time, being
ready to stop it immediately if any unusual noise or
other adverse condition should develop. When start-
ing the compressor, always make sure the oil pump
is functioning properly. Compressor oil pressure
must be as described in the SYSTEM SAFETYS
Section, page 57.
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Check the system operating parameters. Do this
by selecting various read-outs such as pressures
and temperatures. Compare these to test gauge
readings. Record read-outs below:
CHILLED LIQUID TEMPERATURES
Mixed Leaving:_______________________ °F
Ambient Temperature:__________________°F
SYSTEM 1 PRESSURES
Suction:________________________ PSIG
Oil:____________________________ PSID
Discharge: _____________________ PSIG
SYSTEM 2 PRESSURES
Suction: ________________________ PSIG
Oil: ____________________________PSID
Discharge:______________________ PSIG
SYSTEM 3 PRESSURES
Suction:________________________ PSIG
Oil:____________________________ PSID
Discharge: ______________________PSIG
SYSTEM 4 PRESSURES
Suction:________________________ PSIG
Oil:____________________________ PSID
Discharge:______________________ PSIG
MOTOR CURRENT:
SYS 1:_________________________ % FLA
SYS 2:_________________________ % FLA
SYS 3:_________________________ % FLA
SYS 4:_________________________ % FLA
OPTIONS:
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